Endoscope and endoscope system

1. An endoscope system comprising: a processor configured to be selectively connected to one of: a first endoscope including: a first image sensor comprising first pixels configured to pick up a first image and to output a first binary image signal; a first multilevel modulation circuit configured to perform multilevel modulation on the first binary image signal and to output, through a predetermined transmission path, a first multilevel signal; and a first memory configured to store first endoscope information including information on a first number of the first pixels of the first image sensor; on signal transmission; and a second endoscope including: a second image sensor comprising second pixels configured to pick up a second image and to output a second binary image signal; a second multilevel modulation circuit configured to perform multilevel modulation on the second binary image signal and to output, through the predetermined transmission path, a second multilevel signal, and a second memory configured to store second endo scope information including information on a second number of the second pixels of the second image sensor, wherein the second number of the second pixels is larger than the first number of the first pixels, wherein the processor is configured to: in response to the processor being connected to the first endoscope: receive the first multilevel signal through the predetermined transmission path; perform multilevel demodulation on the first multilevel signal received to generate the first binary image signal; in response to the processor being connected to the second endoscope: receive the second multilevel signal through the predetermined transmission path; and perform multilevel demodulation on the second multilevel signal received to generate the second binary image signal; in response to the processor being connected to the first endoscope: read the first endoscope information from the first memory; and set a first multilevel number in the multilevel modulation by the first multilevel modulation circuit based on the information on the first number of the first pixels of the first image sensor in the first endoscope information read; and in response to the processor being connected to the second endoscope: read the second endoscope information from the second memory; and set a second multilevel number in the multilevel modulation by the second multilevel modulation circuit based on the information on the second number of the second pixels of the second image sensor in the second endo scope information read, wherein the processor is configured to set the second multilevel number to be larger than the first multilevel number based on the second number of the second pixels being larger than the first number of the first pixels.

2. The endoscope system according to claim 1 , wherein the first endoscope information further includes at least one of information of a cable length, information of a cable diameter, and information of aged deterioration of a first cable that forms the predetermined transmission path between the first endoscope and the processor, wherein the second endoscope information further includes at least one of information of a cable length, information of a cable diameter, and information of aged deterioration of a second cable that forms the predetermined transmission path between the second endoscope and the processor, and wherein the processor is configured to: set the first multilevel number based on the information on the first number of the first pixels of the first image sensor, a transmission rate of a signal transmitted through the predetermined transmission path and a margin between each value of the first multilevel signal and a threshold used for judgment of each value; and set the second multilevel number based on the information on the second number of the second pixels of the first image sensor, a transmission rate of a signal transmitted through the predetermined transmission path and a margin between each value of the second multilevel signal and a threshold for judgment of each value.

3. The endoscope system according to claim 2 , wherein the processor is configured to: set the first multilevel number based on the information on the first number of the first pixels of the first image sensor and at least one of the information of the cable length, the information of the cable diameter, the information of aged deterioration of the first cable, and information on a frame rate of output of the first image sensor; and set the second multilevel number based on the information on the second number of the second pixels of the second image sensor and at least one of the information of the cable length, the information of the cable diameter, the information of aged deterioration of the second cable, and information of a frame rate of output of the second image sensor.

4. The endoscope system according to claim 1 , wherein the first endoscope information further includes at least one of information of a cable length, information of a cable diameter, and information of aged deterioration of a first cable that forms the predetermined transmission path between the first endoscope and the processor, wherein the second endoscope information further includes at least one of information of a cable length, information of a cable diameter, and information of aged deterioration of a second cable that forms the predetermined transmission path between the second endoscope and the processor, and wherein the processor is configured to: set the first multilevel number using a same number of transmission paths irrespective of a number of output lines of the first binary image signal from the first image sensor; and set the second multilevel number using a same number of transmission paths irrespective of a number of output lines of the second binary image signal from the second image sensor.

5. The endoscope system according to claim 4 , wherein the processor is configured to: set the first multilevel number based on the information on the first number of the first pixels of the first image sensor and at least one of the information of the cable length, the information of the cable diameter, the information of aged deterioration of the first cable, and information on a frame rate of output of the first image sensor; and set the second multilevel number based on the information on the second number of the second pixels of the second image sensor and at least one of the information of the cable length, the information of the cable diameter, the information of aged deterioration of the second cable, and information on a frame rate of out of the second image sensor.

6. The endoscope system according to claim 1 , further comprising the first endoscope, wherein the first multilevel modulation circuit is configured to output a single end signal or a differential signal.

7. The endoscope system according to claim 1 , further comprising the first endoscope, wherein the processor is configured to: check an amplitude of the first multilevel signal received through the predetermined transmission path, and output an amplitude check signal; and set a threshold used for judgment of each value of the first multilevel signal based on the amplitude check signal.

8. The endoscope system according to claim 7 , wherein the first multilevel modulation circuit is configured to change an amplitude of each value of the first multilevel signal based on the amplitude check signal.